/**

 @Title: slider 滑块组件
 @License：MIT

 */

layui.define('jquery', function (exports) {
  "use strict";
  var $ = layui.jquery

    //外部接口
    , slider = {
      config: {}
      , index: layui.slider ? (layui.slider.index + 10000) : 0

      //设置全局项
      , set: function (options) {
        var that = this;
        that.config = $.extend({}, that.config, options);
        return that;
      }

      //事件
      , on: function (events, callback) {
        return layui.onevent.call(this, MOD_NAME, events, callback);
      }
    }

    //操作当前实例
    , thisSlider = function () {
      var that = this
        , options = that.config;

      return {
        setValue: function (value, index) { //设置值
          options.value = value;
          return that.slide('set', value, index || 0);
        }
        , config: options
      }
    }

    //字符常量
    , MOD_NAME = 'slider', DISABLED = 'layui-disabled', ELEM_VIEW = 'layui-slider', SLIDER_BAR = 'layui-slider-bar',
    SLIDER_WRAP = 'layui-slider-wrap', SLIDER_WRAP_BTN = 'layui-slider-wrap-btn', SLIDER_TIPS = 'layui-slider-tips',
    SLIDER_INPUT = 'layui-slider-input', SLIDER_INPUT_TXT = 'layui-slider-input-txt',
    SLIDER_INPUT_BTN = 'layui-slider-input-btn', ELEM_HOVER = 'layui-slider-hover'

    //构造器
    , Class = function (options) {
      var that = this;
      that.index = ++slider.index;
      that.config = $.extend({}, that.config, slider.config, options);
      that.render();
    };

  //默认配置
  Class.prototype.config = {
    type: 'default' //滑块类型，垂直：vertical
    , min: 0 //最小值
    , max: 100 //最大值，默认100
    , value: 0 //初始值，默认为0
    , step: 1 //间隔值
    , showstep: false //间隔点开启
    , tips: true //文字提示，开启
    , input: false //输入框，关闭
    , range: false //范围选择，与输入框不能同时开启，默认关闭
    , height: 200 //配合 type:"vertical" 使用，默认200px
    , disabled: false //滑块禁用，默认关闭
    , theme: '#009688' //主题颜色
  };

  //滑块渲染
  Class.prototype.render = function () {
    var that = this
      , options = that.config;

    //间隔值不能小于 1
    if (options.step < 1) options.step = 1;

    //最大值不能小于最小值
    if (options.max < options.min) options.max = options.min + options.step;


    //判断是否开启双滑块
    if (options.range) {
      options.value = typeof (options.value) == 'object' ? options.value : [options.min, options.value];
      var minValue = Math.min(options.value[0], options.value[1])
        , maxValue = Math.max(options.value[0], options.value[1]);
      options.value[0] = minValue > options.min ? minValue : options.min;
      options.value[1] = maxValue > options.min ? maxValue : options.min;
      options.value[0] = options.value[0] > options.max ? options.max : options.value[0];
      options.value[1] = options.value[1] > options.max ? options.max : options.value[1];

      var scaleFir = Math.floor((options.value[0] - options.min) / (options.max - options.min) * 100)
        , scaleSec = Math.floor((options.value[1] - options.min) / (options.max - options.min) * 100)
        , scale = scaleSec - scaleFir + '%';
      scaleFir = scaleFir + '%';
      scaleSec = scaleSec + '%';
    } else {
      //如果初始值是一个数组，则获取数组的最小值
      if (typeof options.value == 'object') {
        options.value = Math.min.apply(null, options.value);
      }

      //初始值不能小于最小值且不能大于最大值
      if (options.value < options.min) options.value = options.min;
      if (options.value > options.max) options.value = options.max;

      var scale = Math.floor((options.value - options.min) / (options.max - options.min) * 100) + '%';
    }


    //如果禁用，颜色为统一的灰色
    var theme = options.disabled ? '#c2c2c2' : options.theme;

    //滑块
    var temp = '<div class="layui-slider ' + (options.type === 'vertical' ? 'layui-slider-vertical' : '') + '">' + (options.tips ? '<div class="layui-slider-tips"></div>' : '') +
      '<div class="layui-slider-bar" style="background:' + theme + '; ' + (options.type === 'vertical' ? 'height' : 'width') + ':' + scale + ';' + (options.type === 'vertical' ? 'bottom' : 'left') + ':' + (scaleFir || 0) + ';"></div><div class="layui-slider-wrap" style="' + (options.type === 'vertical' ? 'bottom' : 'left') + ':' + (scaleFir || scale) + ';">' +
      '<div class="layui-slider-wrap-btn" style="border: 2px solid ' + theme + ';"></div></div>' + (options.range ? '<div class="layui-slider-wrap" style="' + (options.type === 'vertical' ? 'bottom' : 'left') + ':' + scaleSec + ';"><div class="layui-slider-wrap-btn" style="border: 2px solid ' + theme + ';"></div></div>' : '') + '</div>';

    var othis = $(options.elem)
      , hasRender = othis.next('.' + ELEM_VIEW);
    //生成替代元素
    hasRender[0] && hasRender.remove(); //如果已经渲染，则Rerender
    that.elemTemp = $(temp);

    //把数据缓存到滑块上
    if (options.range) {
      that.elemTemp.find('.' + SLIDER_WRAP).eq(0).data('value', options.value[0]);
      that.elemTemp.find('.' + SLIDER_WRAP).eq(1).data('value', options.value[1]);
    } else {
      that.elemTemp.find('.' + SLIDER_WRAP).data('value', options.value);
    }

    //插入替代元素
    othis.html(that.elemTemp);

    //垂直滑块
    if (options.type === 'vertical') {
      that.elemTemp.height(options.height + 'px');
    }

    //显示间断点
    if (options.showstep) {
      var number = (options.max - options.min) / options.step, item = '';
      for (var i = 1; i < number + 1; i++) {
        var step = i * 100 / number;
        if (step < 100) {
          item += '<div class="layui-slider-step" style="' + (options.type === 'vertical' ? 'bottom' : 'left') + ':' + step + '%"></div>'
        }
      }
      that.elemTemp.append(item);
    }

    //插入输入框
    if (options.input && !options.range) {
      var elemInput = $('<div class="layui-slider-input layui-input"><div class="layui-slider-input-txt"><input type="text" class="layui-input"></div><div class="layui-slider-input-btn"><i class="layui-icon layui-icon-up"></i><i class="layui-icon layui-icon-down"></i></div></div>');
      othis.css("position", "relative");
      othis.append(elemInput);
      othis.find('.' + SLIDER_INPUT_TXT).children('input').val(options.value);
      if (options.type === 'vertical') {
        elemInput.css({
          left: 0
          , top: -48
        });
      } else {
        that.elemTemp.css("margin-right", elemInput.outerWidth() + 15);
      }
    }

    //给未禁止的滑块滑动事件
    if (!options.disabled) {
      that.slide();
    } else {
      that.elemTemp.addClass(DISABLED);
      that.elemTemp.find('.' + SLIDER_WRAP_BTN).addClass(DISABLED);
    }

    //划过滑块显示数值
    that.elemTemp.find('.' + SLIDER_WRAP_BTN).on('mouseover', function () {
      var sliderWidth = options.type === 'vertical' ? options.height : that.elemTemp[0].offsetWidth
        , sliderWrap = that.elemTemp.find('.' + SLIDER_WRAP)
        ,
        tipsLeft = options.type === 'vertical' ? (sliderWidth - $(this).parent()[0].offsetTop - sliderWrap.height()) : $(this).parent()[0].offsetLeft
        , left = tipsLeft / sliderWidth * 100
        , value = $(this).parent().data('value')
        , tipsTxt = options.setTips ? options.setTips(value) : value;
      that.elemTemp.find('.' + SLIDER_TIPS).html(tipsTxt);
      if (options.type === 'vertical') {
        that.elemTemp.find('.' + SLIDER_TIPS).css({
          "bottom": left + '%',
          "margin-bottom": "20px",
          "display": "inline-block"
        });
      } else {
        that.elemTemp.find('.' + SLIDER_TIPS).css({ "left": left + '%', "display": "inline-block" });
      }
    }).on('mouseout', function () {
      that.elemTemp.find('.' + SLIDER_TIPS).css("display", "none");
    });
  };

  //滑块滑动
  Class.prototype.slide = function (setValue, value, i) {
    var that = this
      , options = that.config
      , sliderAct = that.elemTemp
      , sliderWidth = function () {
        return options.type === 'vertical' ? options.height : sliderAct[0].offsetWidth
      }
      , sliderWrap = sliderAct.find('.' + SLIDER_WRAP)
      , sliderTxt = sliderAct.next('.' + SLIDER_INPUT)
      , inputValue = sliderTxt.children('.' + SLIDER_INPUT_TXT).children('input').val()
      , step = 100 / ((options.max - options.min) / Math.ceil(options.step))
      , change = function (offsetValue, index) {
        if (Math.ceil(offsetValue) * step > 100) {
          offsetValue = Math.ceil(offsetValue) * step
        } else {
          offsetValue = Math.round(offsetValue) * step
        }
        offsetValue = offsetValue > 100 ? 100 : offsetValue;
        sliderWrap.eq(index).css((options.type === 'vertical' ? 'bottom' : 'left'), offsetValue + '%');
        var firLeft = valueTo(sliderWrap[0].offsetLeft)
          , secLeft = options.range ? valueTo(sliderWrap[1].offsetLeft) : 0;
        if (options.type === 'vertical') {
          sliderAct.find('.' + SLIDER_TIPS).css({ "bottom": offsetValue + '%', "margin-bottom": "20px" });
          firLeft = valueTo(sliderWidth() - sliderWrap[0].offsetTop - sliderWrap.height());
          secLeft = options.range ? valueTo(sliderWidth() - sliderWrap[1].offsetTop - sliderWrap.height()) : 0;
        } else {
          sliderAct.find('.' + SLIDER_TIPS).css("left", offsetValue + '%');
        }
        firLeft = firLeft > 100 ? 100 : firLeft;
        secLeft = secLeft > 100 ? 100 : secLeft;
        var minLeft = Math.min(firLeft, secLeft)
          , wrapWidth = Math.abs(firLeft - secLeft);
        if (options.type === 'vertical') {
          sliderAct.find('.' + SLIDER_BAR).css({ "height": wrapWidth + '%', "bottom": minLeft + '%' });
        } else {
          sliderAct.find('.' + SLIDER_BAR).css({ "width": wrapWidth + '%', "left": minLeft + '%' });
        }
        var selfValue = options.min + Math.round((options.max - options.min) * offsetValue / 100);
        inputValue = selfValue;
        sliderTxt.children('.' + SLIDER_INPUT_TXT).children('input').val(inputValue);
        sliderWrap.eq(index).data('value', selfValue);
        sliderAct.find('.' + SLIDER_TIPS).html(options.setTips ? options.setTips(selfValue) : selfValue);
        //如果开启范围选择，则返回数组值
        if (options.range) {
          var arrValue = [
            sliderWrap.eq(0).data('value')
            , sliderWrap.eq(1).data('value')
          ];
          if (arrValue[0] > arrValue[1]) arrValue.reverse(); //如果前面的圆点超过了后面的圆点值，则调换顺序
        }

        //回调
        options.change && options.change(options.range ? arrValue : selfValue);
      }
      , valueTo = function (value) {
        var oldLeft = value / sliderWidth() * 100 / step
          , left = Math.round(oldLeft) * step;
        if (value == sliderWidth()) {
          left = Math.ceil(oldLeft) * step;
        }
        return left;
      }

      //拖拽元素
      , elemMove = $(['<div class="layui-auxiliar-moving" id="LAY-slider-moving"></div'].join(''))
      , createMoveElem = function (move, up) {
        var upCall = function () {
          up && up();
          elemMove.remove();
        };
        $('#LAY-slider-moving')[0] || $('body').append(elemMove);
        elemMove.on('mousemove', move);
        elemMove.on('mouseup', upCall).on('mouseleave', upCall);
      };

    //动态赋值
    if (setValue === 'set') return change(value, i);

    //滑块滑动
    sliderAct.find('.' + SLIDER_WRAP_BTN).each(function (index) {
      var othis = $(this);
      othis.on('mousedown', function (e) {
        e = e || window.event;

        var oldleft = othis.parent()[0].offsetLeft
          , oldx = e.clientX;
        if (options.type === 'vertical') {
          oldleft = sliderWidth() - othis.parent()[0].offsetTop - sliderWrap.height()
          oldx = e.clientY;
        }

        var move = function (e) {
          e = e || window.event;
          var left = oldleft + (options.type === 'vertical' ? (oldx - e.clientY) : (e.clientX - oldx));
          if (left < 0) left = 0;
          if (left > sliderWidth()) left = sliderWidth();
          var reaLeft = left / sliderWidth() * 100 / step;
          change(reaLeft, index);
          othis.addClass(ELEM_HOVER);
          sliderAct.find('.' + SLIDER_TIPS).show();
          e.preventDefault();
        };

        var up = function () {
          othis.removeClass(ELEM_HOVER);
          sliderAct.find('.' + SLIDER_TIPS).hide();
        };

        createMoveElem(move, up)
      });
    });

    //点击滑块
    sliderAct.on('click', function (e) {
      var main = $('.' + SLIDER_WRAP_BTN);
      if (!main.is(event.target) && main.has(event.target).length === 0 && main.length) {
        var left = options.type === 'vertical' ? (sliderWidth() - e.clientY + $(this).offset().top) : (e.clientX - $(this).offset().left),
          index;
        if (left < 0) left = 0;
        if (left > sliderWidth()) left = sliderWidth();
        var reaLeft = left / sliderWidth() * 100 / step;
        if (options.range) {
          if (options.type === 'vertical') {
            index = Math.abs(left - parseInt($(sliderWrap[0]).css('bottom'))) > Math.abs(left - parseInt($(sliderWrap[1]).css('bottom'))) ? 1 : 0;
          } else {
            index = Math.abs(left - sliderWrap[0].offsetLeft) > Math.abs(left - sliderWrap[1].offsetLeft) ? 1 : 0;
          }
        } else {
          index = 0;
        }
        change(reaLeft, index);
        e.preventDefault();
      }
    });

    //点击加减输入框
    sliderTxt.children('.' + SLIDER_INPUT_BTN).children('i').each(function (index) {
      $(this).on('click', function () {
        inputValue = sliderTxt.children('.' + SLIDER_INPUT_TXT).children('input').val();
        if (index == 1) { //减
          inputValue = inputValue - options.step < options.min
            ? options.min
            : Number(inputValue) - options.step;
        } else {
          inputValue = Number(inputValue) + options.step > options.max
            ? options.max
            : Number(inputValue) + options.step;
        }
        var inputScale = (inputValue - options.min) / (options.max - options.min) * 100 / step;
        change(inputScale, 0);
      });
    });

    //获取输入框值
    var getInputValue = function () {
      var realValue = this.value;
      realValue = isNaN(realValue) ? 0 : realValue;
      realValue = realValue < options.min ? options.min : realValue;
      realValue = realValue > options.max ? options.max : realValue;
      this.value = realValue;
      var inputScale = (realValue - options.min) / (options.max - options.min) * 100 / step;
      change(inputScale, 0);
    };
    sliderTxt.children('.' + SLIDER_INPUT_TXT).children('input').on('keydown', function (e) {
      if (e.keyCode === 13) {
        e.preventDefault();
        getInputValue.call(this);
      }
    }).on('change', getInputValue);
  };

  //事件处理
  Class.prototype.events = function () {
    var that = this
      , options = that.config;
  };

  //核心入口
  slider.render = function (options) {
    var inst = new Class(options);
    return thisSlider.call(inst);
  };

  exports(MOD_NAME, slider);
})